Question

sendo A=x-3, B=x²+3 e C=9x, o valor de A²-B+C é?

Answer 1

A = x - 3

B = x² + 3

C = 9x

= A² - B + C

= (x - 3)² - (x² + 3) + 9x

= x² - 2.3x + 9 - x² - 3 + 9x

= x² - 6x + 9 - x² + 9x - 3

= x² - x² - 6x + 9x + 9 - 3

= 3x + 6